Spark-plug.



F. J. WALKER & P. G. LOEFFLER.

SPARK PLUG.

APPLICATION FILED JAN. 9, 1912.

Patented Dec. 2, 19,13.

unirnn srnrrns PATENT orrion.

FREDEIGH J. WALKER AND FRANK C. LO EEFLER, OF DES MOLNES, IOWA. I

SPARK-PLUGn:

nosaosa- Specilieation of Letters Patent.

Application filed January 9, 1912. Serial No. 670,301.

PatentedDec. 2, 1913.

You whom it may concern k v it known that We, FRIEDRICH J. WALKER and FRANK O. Lonrrrnn, citizens of the UnitedStates residing at Des .Moines, in the county of Folk and State of Iowa, have invented a new and'useful Spark-Plug, of

. More particularly, itis our'object to provide a spark plug in which one of the wires between which the spark ga is formed, may be easily moved longitudlnally of the spark plug, by means operated; from outside the cylinder and'may be held in any position of its movement.

A- further object is to provide a spark plug ofsuch construction as to permit only a minimum of oil or other matter to drop into the combustionspace. in the upper end of the plug and at the same time to givea maximum of such combustion space.

Our invention consists in certain details;

in the construction arrangement-and combination of the various parts, whereby the after more fully set forth; pointed out in our claims, and illustrated in the accompanying drawings, in which Figure 1 isa'side elevation of a spark plug embodying our invention. Fig. 2 shows a vertical, central, sectional view of the same.- Fig. 3 is a top or plan view of the inner'end of our spark lug, and-Fig. 4: isan' inverted, plan view of the oute'r end of said spark plug.

In the accompanying drawings, we have used the reference numeral 10, to indicate the angular body of the spark plug, on which is formed a screw threaded extension 11, designed to be received in a screw threaded opening in a cylinder. In the screw threaded extension 11, is a recess 12,

and in the body 10 is a'screw threaded re=- cess inswhich is received a screw plug 13. The recess 12 commumcates with the recess 4 in the body 13, by means of'an opening 1 1.

10. The screw 13 is provided with a longitudinal opening.

Mounted in thelongitudinal opening in the screw 13, is an elongated porcelain body 15,which is provided with an annular ring 16, designedto rest adjacent' to the end of the screw 13 in the opening in the bodylO, as shown inFig. '2. The'porcelain 15 e2;- tends from a position approximately flush with the end of the extension 11 to a point beyondthe outer end of the spark plug.

On the outer end of the porcelain is a metal cap 17 Extending longitudinally through the porcelain '15, and through the cap 17, is a wire 18, for conducting electricity. The

outer end of said wire 18 is screw threaded,

and on said screw threaded end, is mounted a'metalcap '19. On,the inner end of the wire 18,is a head 20, the inner end of which is approximately fiat, as shown'in Figs. 1,

2, and 3, which, as shown in Fig.2, has the shape of a truncated cone, the sides of which are incurved, Near the" outer edge of the outersurface of the body 10, is a screw threaded opening, in which is mounted a screw 21, said screw threaded opening being inclined from the outer side of the body 10,

--toward the inner end of the spark plug, and

toward thecenter thereof' Communicating -with the opening 12, and the inclined opening last described, is a small opening inobjects contemplated are attained, as. here- *inclined opening last described. Mounted in the screw 12 and in the second inclined opening in the body 10, is a Wire 22 tor'conducting electricity. The outer end of the wire 22 is screw threaded, as is the opening in the screw 21, and on the outer end of the wire 22 is a head 23. It will be noted that the inner end of the wire 22 is not sharp, but rounded as shown in Fig. 2. It will thus be seen that the wire 22 is inclined from a point-near the outer edge of the outer end of the body 10, toward the center of said body, and toward the inner end thereof. The inner end of the wire-22 is designed to be near the head-20. Onaccount of its screw threaded outer end, it can be screwed current conducting wires are connected with the wires 18 and 22. It will be readily seen that the spark gap between the inner end of the "ire 22, and the head 20, may be increased or diminished.

The advantages of a device of this kind are obvious. 1t frequently occurs that in two cylinders in the same engine, the spark gap should be of diiferent width, and in the spark plugs in ordinary use, the width of the ga p can be varied only by removing the spark plug from the cylindtr and bending the inner ends of the electricity conducting wires. In our device, by longitudinally adjusting the wire 22, the distance of the spark gap may be varied as desired. The pitch of the screw threads of the wire 22 and the screw 21 may be such that the spark plug may be very accurately adjusted. Our device is of simple, durable, and inexpensive construction, and can be used with any ordinary gasolene engine. The form of the head 20 is such that it allows only a minimum of oil to drop into the combustion space or chamber. The size of the opening 12 is large enough to form a considerable combustion space. The inclination of the wire 22 is such as to enable us to locate a screw 23 at a convenient point for operation out side the cylinder and spaced from the porcelain '15.

We claim as our invention:

1. In a device of the class described, a spark plug body, an elongated insulating body detachably mounted therein, an electrode detachably mounted in said insulating body, its inner end extending beyond said body, clamping means on the outer end thereof for securing a current carrying wire thereto, said body being provided with a passage for a second electrode extending obliquely through said body from a point within the cylinder when the body is at- .tached thereto to-a point outside said cylinder and with an enlarged internally screw threaded recess at the outer end of said opening, a ground electrode adjustably mounted in said opening and extending from a point near the inner end of the first elec-- trode at an acute angle thereto to a point outside the outer end of the spark plug body, saidground electrode being screwthreaded over the outer portion of it's length,a head -on said ground electrode, a screwthreaded plug mounted in said recess, said screwthreaded plug being provided with a screwthreaded opening in which the screwthreaded portion of said ground electrode is received, and with a head on its outer end, and packing material in said recess between said screw threaded plug and said body.

2. In a device of the class described, a spark plug body having recesses at both'ends and a partition between said recesses in which is an. opening, an elongated irisulat ing body having one end extended through said opening and provided with a shoulder adjacent thereto, a plug mounted on said insulating body and screwed into one of the said recesses in said spark plug against said shoulder,'an electrode extending longitudi nally through said insulating body, a ground electrode slidingly mounted in said spark plug body, and extending from a point near the inner end of the first electrode at an acute angle thereto, through the spark plug body, to a point outside the same, a plug screwed on said ground electrode and screwed into said body, and a head on the outer end of said ground electrode.

3. In a device of the class described, a spark plug body, having a recess at its inner end an insulating body mounted therein, an electrode mounted in said insulating body its inner end extending beyond said body, clamping means on the outer end thereof for securing a current carrying wire thereto, a ground, a second electrode adjustably mounted in said insulating body and extending from a point near the inner end of the first electrode at an acute angle thereto and extending to a point outside the outer end of the spark plug body, said ground electrode being screwthreaded over the outer portion of its length, a head on said ground electrode a screwthreaded plug mounted in the outer end, said spark plug body, said screwthreaded plug being provided with a screwthreaded opening in which the screwa 'FREDRICH J. WALKER. FRANK C. LOEFFLER.

Witnesses Bess E. DEAL, MARY WALLACE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

